upright balance weight

[gordon stelter]

In agree with Terry. 1890's Knabes are amazing pieces
of craftmanship. And the upright actions have curious
geometries which, I believe, lend them a much closer
approximation to a grand touch than other uprights.
Does yours have the wooden action frames & rocker
capstans ?
     Thump

--- Michael Gamble <michael@gambles.fsnet.co.uk>
wrote:

> Hello Terry and List
> There's an awful lot needs discussion - about
> uprights. One item your posting brought out was the
> issue of UW. This, I suppose, is Uplift Weight? On
> page 165 of Max Matthias book "Steinway Service
> Manual" he gives the factory key weighting as 47g.
> and the Uplift weight 20gr. with the dampers raised.
> There are several other important facts discussed in
> the book, about grands and upright S&S, but is it
> possible to show, graphically, how this Uplift
> Weight is calculated and derived?
> Regards from a freezing, sunny Sussex-on-Sea
> Michael G.(UK)
>   ----- Original Message ----- 
>   From: Terry 
>   To: Pianotech 
>   Sent: Friday, February 25, 2005 1:02 AM
>   Subject: Re: upright balance weight
> 
> 
>   I don't know what might be a good BW for an
> upright. I have lots of questions about balancing an
> upright action. Rumors have it that David Stanwood
> is looking into upright action balancing. In your
> case you have a lot of UW, if you don't have too
> much lead in the keys now, you could add a little
> lead to the front of the key to get the DW down to
> 50g or so and still have over 30g UW. How does the
> capstan/wippen-heel-cushion interface line up -
> would moving the capstan help or hinder? Also, what
> is the status of you butt springs - the tension
> there will affect things also.
> 
>   Do you have a picture of your Knabe? 1890s Knabes
> are just awesome!
> 
>   Terry Farrell
> 
>     What would be optimal balance weight for an
> upright?
> 
>     My searching has revealed a suggested lower
> 40's. I have a 56 gDW, 37gUW.  friction is ~10
> grams. 46gBW.
> 
>     I'm thinking I need a 4 gram drop in BW. Sure I
> know it's just an upright but I want performance.
> I'm thinking capstan move.
> 
>     Kpiano



		
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